Furnace-pipe construction



July 20 1926.

G. HARMs Funmc PIPE cousraucuou Filed June 15, 1925 Patented July Ztl, i925.

GEORGE Hamas, or encara, rLLiNors.

FURNACE-PIPE CONSTRUCTION.

This invention pertains to hot air pipes or heating pipes of that type designed to be placed in walls and partitions for conveying heated air from a heating` source to rooms to be supplied therewith.

More particularly the invention has to do with pipe sections of rectangular form adapted to be fitted into one Aanother fo-r building up a stack within a wall or partition for heat conducting purposes, though nature described and to dispose the saineA at positions on each section distant from the ends of the latter so that said means cannot become misshapen during handling.

Still another object is to provide a dual form of locking means for pipe sections so arranged that but one of said means maybe engaged with that of a companion section as avpreliminary step in assembling pipe sections and for a purpose to be made known herein.

A further objectV is the construction of a pipe section, having spaced walls, wherein the portion of the outer wall which nests with the companion portion of a companion section is slanted inwardly in the direction of the inner wall andthe terminal end of the section, said outer wall portion including spaced beads or shoulders paralleling the said end of the section to engage correspondingly disposed beads or shoulders of said companion sect-ion, the purposes and advantages of which will appear herein.

Besides these objects the invention seeks to provide a novel construction in a double pipe all of which will be made lnownin the following description aided by the accompanying' drawing forming part hereof wherein:

Figure 1 illustrates in perspective a portion of a furnace-pipe section in accordance with my invention.

as 'brace 5 whose form and purpose will be made known presently. rllhe said outer wall Figure 2 is a longitudinal section, much enlarged, of parts of two pipe sections showing their partial engagement for a preliminary locking thereof, and

Figure 3 is a similar viigure showing the complete engagement or the dual locking of the two sections.

Figure 4 is a slightly modified form of the invention.

In the past, pipe sections of the type named herein have included an arrangement whereby they may be engaged with one another so that they will be held from movement relatively, and one of the forms known has included a form of double locking arrangement but the locking means have been so placed on each section that in being atthe extreme end thereof one of them is always subject to damage during handling so that having becomevmisshapen the sections cannot be assembled in proper locking position if indeed engagement can be effected at all. l

One of my purposes, therefore, is to provide a construction wherein the locking means is disposed inward from the extremity of the section .where it is protected and where it will not be subjectto distortion during roughhandling so that sections of pipes can, therefore, always be assembled without dil'iiculty and will always have a snug and proper tit.

it portion of apipe section according to 4my invention isshown in Figure l and is made up of a customary inner wall l and an outer wall designated in general by the chararter 2, the form of the latter being best shown in Figures and 3, the two Vwalls being separated as usual to create an air space 3. Lhe edge of said outer wall 2, or what may be termed its end, is recurved and lapped over the end of the inner wall at el, there being also lapped with it a 2 is outwardly flared from the lap 4l about as shown at G, thence having an outwardly proiecting shoulder or locking bead 7 created by bending the metal at 8 slightly inward toward the wall 1,-and from thence the wall extends at a less abrupt angle, or more nearly Vparallel to said wall l, but gradually flaring outwardly, and some distance from said locking bead '7 the said wall 2 'extends still further outwardly to form a somewhat abrupt shoulder or abutment 9, then continuing parin Figures l and 2, or it may be a sepa 'ate part as in .Figure e. Substantially midway between the shoulder' or abutment 9 and the :second lochii bead T a bead 10 is created by creasing the metal inwardly toward the wall l. and it may be seenthat the slant ot thc described outer wall is in the general direction otl the inner wall froni'the abutment Si to the extremity oithe pipe section, this being true ot a companion section to be reiterredto later as the female portion of the structure.v This form provides for veasy nesting ofthe sections inone another since one may easily enter into thc other with a minimum distance ot lateral springing movement of the metal as the beads or shoulders pass one another. Yet the said beads when interloched torni a. mostv positive holding means ttor walls which, witl'ioutthem, would readilyseparate. Butv while the beaded wall recedes in the manner shown and described l do not wish to be understood aslimiting myself to the particular dispositionfthereoif.y

Sill tour sides otthe rectangular' pipe section may be formed in accordance withfthe foregoing so that the locking beads 7, 10 and the angled wall portion shown inv Figures and 3 extend around the said tour sides. rlhe outer wall 2 is more or less yielding in the direction otl the said inner wall l and preferably abrace 5 previously referred to is provided. rlhis is a strip ot' metal having a right angled bend near one end forming a i'oot 5. The main portion ot the brace lies against the inner wall l while the said -foot o extends therefrom in the direction of the wall i2v and may lie in a slightly spaced relaL tion thereto permitting the latter wall to move slightly inward as pressure placed thereon occurs, due to the connecting of the sections. Said brace serves to limit the inward movement oi the wall 2, as may be seen, making 'tor a more tiri'n locking engagement of the sections.

Naturally, each section is provided at each end with the structure described though one end carries what may be termed the male, while the other is provided with the female arrangement, the reference characters being identical except as to the use of exponents for diii'erentiating purposes.

When fully engaged as in Figure 3, the lapped ends ot companion sections abut upon the shoulders 9 and the beads T and l0 nest in one another in tirm seated relation.

The use of a so-called double locl prevents the sections rocking upon one another laterally and is a very desirable arrangement for the purpose, together with the :fact that a sta 'k when interlocled can be readily handied without danger of its sections becoming disengaged.

Now, while the double lock feature is not in itsel'lE 1n as already intimated, one olf my pr. Aposes as stated earlier herein is that or spac'ng the beads or shoulders in.vardly trom the extremities ofi the sections where neither'can' be subjected to shocks or blows that would otherwise tend to bend, break, or mash them out ot shape, especially the outer one It is noted,that the ends oi. the sections at Ll taire any such abuse while the be -ds I and l() lie well inward therefrom where no damage thereto can result. And by folding together the inner and outer walls together with the bi a double strengthening ot the ends results so that there can he no great injury to the saine.

Another advantage in thev locking means asr provided by nie is that the` sections can he locked in a preliminary manner, so to speak, by engaging the first meeting beads 7, l0 as in Figure 2,--and'the stack so assen'iblei'l can be readily moved about more convenieni;- i

y than separate sections, and that Lne stack may be`elevatec t position in a wall without danger of the sections becoming disengaged from one another, whereupon ii" a desired position is l'ound correct, or il: certain oi the sections are to be removed they may be readily separated, and the balance o'li them forced together in the double locl-ed ci'igagen'ient. Quite often when raising a stach within a wall it is toundthat an olistruction prevents linal placing` thereof and it is then necessary to remove all or part oil: the sections so that suoli obstruction m y be removed. lt is quite necessary that pipe sections should lirn'ily lock together when permanently in place'in the wall but inthe et-Loeiiinental entrance of the stach the loching ot the sections would lead to serions trouble since more Otten it might be impossible to disengage said sections. New, by providing' an initial locking, which at the .saine time admits oi: easy separation, no trouble would be experienced. ely structure admitsol this and ol considerable impor-- tance inconnection with this adaptability the fact that since the beads or shoulders T, 7 extend around the sections parallel io their ends these when engaged serve to hold the sections of a stack in a perfectly straipfjht line or with their sides all in the saine plane so that when elevated the ready entrance oi? all ot' them into a narrow space will be sured.

Due to the torni oflocl; used it would be quite diiiicult if not impossible after 'full engagement to separate the sections by a direci' end pull, requiring that a lateral movement one on the other be resorted to in order to eli'ect disengagement. This action lifts the beads at one side 'from engagement-allowing separation and since this lateral action cannot be made use of whenV a stack is in the wall the partial enn. uw)

gagement above described is advantageous as permitting adpistments or removals ot desired sections.

Wlhile l have shown a preferred einbodi" nient ot the invention answering well the requirements in practical use the structure may be varied slightly from that shown while still within the spirit of the'invention and within the scope of the appended claims.

In Figure l the slightly diii'erent arranged ment is provided as showing another manner oi constructing the pipe section and as making for ease of manufacture of the beaded portion. That is to say, the portion G, 8, which in the earlier figures is an integral part oif either of the wall portions l, 2, is a separate part. ln this Yform the upper edge at at ot the named portion engages over the wall l only, i. e., without including the brace i-described, while at its lower edge it is recurved as at 12 and engages over the edge oi" the now shortened wall and pinched or gripped npon the same.

Again, between the recurved portion l2 and the bead lO the portion is recurved upon itsel't' as at ll forming a foot which lies substantially at right angles to and extends toward the wall l and takes the place ot the foot 5 of the earlier iigures.

The device may be constructed thus and lends itselt' to more ready handling during n'ianutacture, either type described being open :tor use.

I claim:

l. A pipe section olf the class described including spaced inner and outer walls joined at their ends, a portion or one ont the walls near one end oit' said section being spaced -a less distance from the other wall than the balance thereof, said portion having a pair ot beads extendingl theret'roin spaced troni one another and both spaced iroin the end oi? the section, said beads lorniing separate and independent ineans arianged ttor separately or jointly locking with those oif a companion section.

2. A pipe section oit the class described including spaced inner and outer walls, a portion oi one of the walls near one end of said section being spaced a less distance Ytroni the other wall than the balance thereof and having a pair oi beads extending' from its surface lying parallel to the plane of the end oi the section and so disposed that the beads ol a similarly formed companionsection may be locked therewith in two diii'erent relative positions ot the sections.

3. A pipe section of the class described iin-hiding spaced inner and outer walls lined relatively to one another at their opposite ends, one of the walls at one end ot the section extendingv at an angle away from the other wall in the general direction oi the opposite end of the section, such angled wall having disposed in its length a pair of spaced locking beads paralleling 'the adjacent end off the section and spaced therefrom, `and a, conipanion section similarly formed, one set of the beads ot the two sections adapted to initially loci: together in a partial engagement of said sections, and both adapted to interlock when the sections are fully nested;

fl. A pipe section of the class described .including spaced inner and outer walls lined relatively to one another at their oppo` site ends, one oi1 the walls at, each end oit the section extending 'at an angle away from the other wall in 'the general direction of the op posits end of the section, such angled walls having a pair ot locking beads spaced from one another and lying between the ends oi' the section paralleling said ends, one of said beads adapted to permit initial locking with a corresponding` bead ot a companion section in a partial assemblingl of the sections,

and both beads adapted to interlock with thoe of said companion section when the sections are completely' seated in one another.

5. A pipe section rectangular in form, oi the class described, having an inner and an outer wall spaced from one another connected at opposite ends, one of said walls for a part of its length extending at an angle away trom the other wall in the general direction of the opposite end oil the section, cach angled portion having a bead formed therein in two different po-y sitions spaced from one another and both spaced inwardly from the marginal edges of the ends of the section and lying parallel to said ends, said angled portions being formedfin the outer wall at one extremity ot the section and in the inner wall at the other extremity of said section, the bead nearest the extremity ot the section adapted to interlock with a similarly placed bead oli a companion section whereby the two sections,y may be initially engaged, both beads of the section adapted to interlock when the sections are iiully seated upon one another.

G. A pipe oli the class described niade up ol sections each comprising an inner and an ontcr wall spaced from one another, the end ot the outer wall of one oi said sections being atlixed to the end of the inner wall and extending away from the latter at an angle in the general direction of the opposite end oit the section, the inner wall of a companion section being alike iixed to the enter wall and extending away from the saine in the general direction ot the opposite end of that section, the last named section adapted to receive the iii-st named section into it, and both sections having in each of the described angled portions thereof a pair of spaced beads spaced inward from the ends of their respective sections, one of lll) llo'

the beads of a section adapted to interlock successively with both beads oi the other section as the said sections are brought to seating positions.

7. A pipe ot the class described made up oit sections each comprising an inner and an outer wall spaced troni one another, the end oi" the enter wall of one o'lI said sections being afiiired to the end ot the inner wall and extending` away frein the latter at an angle in the general direction oit the opposite end ot the section, the inner wall o' a companion section being alike tixed to thev outer wall and extending away troni the saine at an angle in the general direction or the opposite end of the section, the last named section adapted to receive the end oi the i'irst named section into it, and' both sections having in each of the described angled portions thereoi appai-r of spaced beads spaced inward troni the ends of their respective sections,y the outermost beads ot the sections adapted to engage one another in the initial nesting action toi hold said sections relatiyely, and then to engage the innerniost beads in the tinalor complete nesting' ot sach sections.

8. i-r pipe ot the class described made up oi? sections each comp isingl an inner and an outer wall spaced from one another, one ot' the walls at one end of each oi two adjacent sections being angled away 'roin the other in the general direction oi' the opposite end ot the section oit which it is a part, the angled portion oi'E each having a pair of spaced beads spa ed'l irom the extremities et the section, the bead nearest the end of a section adapted to interlock either bead of the other section.

9. A rectangular pipe section of the class described including two walls, the ends o1PA the walls at one end of the section having a lined relation, one of said walls extending away from the other wall at an angle thereto and away troni said end ot the section and having spaced relation to said other wall, the angled portion having a pair of parallel Ispaced beads formed therein spaced 'troni the end o't the section to engage like beads of a companion section, said beads being so disposed that they engage one another in successive order in the nesting act, and a brace tixed with respect to the said walls, lying between the saine and having an extension projecting in the direction` of the wall having the angled portion, said extension beingA norreally spaced iiroin such angled portion and adaited for limiting the n'ioveinent ot the saine in the direction oi' the opposite wall.

i0. :l pipe section or unit of the class described including in its construction spaced inner and enter walls each substantially iaralleling one another for a part oi" their lengths, the outer wall terminating at one end oi the section in a portion bridging the spae between said walls, said portion eX- tending in one continuous general slanting direction toward the end oit the inner wallA and at its end engaging the latter, there being a pair ot beads 'formed in said portion prii'all'el'i'ng the plane ot the cnd ot' the section, one or both beads adapted to interlock with like beads of a companion section, sai'd beads oeing spaced both from the extremity of the section4 and Vfrom each other and b th lying between the planes oi the walls, that l oty said portion lying between the beads slanting in said general direction toward the inner wall;

ll. r3.. rectangular section or unit oi: the class described having spaced inner and enter walls each terminating at one end in a portion bridging the space between said walls, said portion extending in one continuons general slanting direction toward the end of the companion walll and at its extremity engaging the end of the latter, there being a pair ot beads formed in each portion paralleling the planes oi the ends ot the section both adapted to interlock with like beads ofa companion section, said beads being` spaced both from the extremity or the section and troni each other, and both lying between the planes oi' said walls,A that part. oi" said portion lying between the beads slanting in said general direction toward the said companion wall.

lin testimony whereof l alii); my signature.

GEORGE Hanns. 

